[patch 3/8] xtensa: variant irq set callbacks

[Johannes Weiner <jw@emlix.com>]

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Allow the core variant code to provide irq enable/disable callbacks.

The s6000 has a crossbar that multiplexes peripheral IRQ lines to a
smaller number of core lines.  These callbacks allow the s6000 variant
to program the crossbar when core lines are toggled.

Signed-off-by: Johannes Weiner <jw@emlix.com>
---
 arch/xtensa/Kconfig           |    3 +++
 arch/xtensa/include/asm/irq.h |    7 +++++++
 arch/xtensa/kernel/irq.c      |   14 ++++++++++++++
 3 files changed, 24 insertions(+)

--- a/arch/xtensa/Kconfig
+++ b/arch/xtensa/Kconfig
@@ -51,6 +51,9 @@ source "kernel/Kconfig.freezer"
 config MMU
 	def_bool n
 
+config VARIANT_IRQ_SWITCH
+	def_bool n
+
 menu "Processor type and features"
 
 choice
--- a/arch/xtensa/include/asm/irq.h
+++ b/arch/xtensa/include/asm/irq.h
@@ -14,6 +14,13 @@
 #include <platform/hardware.h>
 #include <variant/core.h>
 
+#ifdef CONFIG_VARIANT_IRQ_SWITCH
+#include <variant/irq.h>
+#else
+static inline void variant_irq_enable(unsigned int irq) { }
+static inline void variant_irq_disable(unsigned int irq) { }
+#endif
+
 #ifndef PLATFORM_NR_IRQS
 # define PLATFORM_NR_IRQS 0
 #endif
--- a/arch/xtensa/kernel/irq.c
+++ b/arch/xtensa/kernel/irq.c
@@ -132,6 +132,18 @@ static void xtensa_irq_unmask(unsigned i
 	set_sr (cached_irq_mask, INTENABLE);
 }
 
+static void xtensa_irq_enable(unsigned int irq)
+{
+	variant_irq_enable(irq);
+	xtensa_irq_unmask(irq);
+}
+
+static void xtensa_irq_disable(unsigned int irq)
+{
+	xtensa_irq_mask(irq);
+	variant_irq_disable(irq);
+}
+
 static void xtensa_irq_ack(unsigned int irq)
 {
 	set_sr(1 << irq, INTCLEAR);
@@ -146,6 +158,8 @@ static int xtensa_irq_retrigger(unsigned
 
 static struct irq_chip xtensa_irq_chip = {
 	.name		= "xtensa",
+	.enable		= xtensa_irq_enable,
+	.disable	= xtensa_irq_disable,
 	.mask		= xtensa_irq_mask,
 	.unmask		= xtensa_irq_unmask,
 	.ack		= xtensa_irq_ack,

--